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Characterization and quantitively analysis on the high solid anaerobic digestion in the large scale Stirred Tank Reactor

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  • Fang, Xiang
  • Li, Xueren
  • Li, Xiujin
  • Fan, Jiaqi
  • Yan, Yihuan
  • Tu, Jiyuan

Abstract

While high solid anaerobic digestion has the potential to produce more biogas with the same anaerobic reactor, its rheological behavior can lead to short-circuiting and dead zones, significantly limiting the anaerobic fermentation efficiency. This study numerically investigates the sludge movement in an industrial-scale continuously stirred tank reactor and explores the dynamic characteristics of the anaerobic digestion process under varied agitation conditions and sludge properties. A novel approach was developed, estimating the biogas production rate based on local fluid behavior. The numerical results revealed that over-agitation can restrict anaerobic digestion efficiency, with the critical value increasing as total solid content rises. For 16.4 % total solids (TS) active sludge, the highest biogas production rate was achieved at 30 RPM in this study. In contrast, the biogas production rate of 18.7 % TS active sludge continuously increased with agitation rate, with over-agitation speeds considered to be over 80 RPM.

Suggested Citation

  • Fang, Xiang & Li, Xueren & Li, Xiujin & Fan, Jiaqi & Yan, Yihuan & Tu, Jiyuan, 2025. "Characterization and quantitively analysis on the high solid anaerobic digestion in the large scale Stirred Tank Reactor," Renewable Energy, Elsevier, vol. 241(C).
    • Handle: RePEc:eee:renene:v:241:y:2025:i:c:s0960148124023942
    DOI: 10.1016/j.renene.2024.122326
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